166516373 has 4 divisors (see below), whose sum is σ = 169001760. Its totient is φ = 164030988.

The previous prime is 166516369. The next prime is 166516379. The reversal of 166516373 is 373615661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 373615661 = 277 ⋅1348793.

It is a cyclic number.

It is not a de Polignac number, because 166516373 - 2² = 166516369 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166516379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1242593 + ... + 1242726.

It is an arithmetic number, because the mean of its divisors is an integer number (42250440).

Almost surely, 2^166516373 is an apocalyptic number.

It is an amenable number.

166516373 is a deficient number, since it is larger than the sum of its proper divisors (2485387).

166516373 is an equidigital number, since it uses as much as digits as its factorization.

166516373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485386.

The product of its digits is 68040, while the sum is 38.

The square root of 166516373 is about 12904.1223258306. The cubic root of 166516373 is about 550.1557388167.

The spelling of 166516373 in words is "one hundred sixty-six million, five hundred sixteen thousand, three hundred seventy-three".